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Answer: How to deal with undefined returned variables.

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Q&A > subroutines > How to deal with undefined returned variables. contributed by knight

davorg presents the common idiom, but note that it can lose if the actual value returned is "defined but false", e.g. 0 or "0". To handle this robustly can be done in two lines:
$CONFIG{HASHTYPE} = $cfg->val("MISC","HASHTYPE"); $CONFIG{HASHTYPE} = "shal" if ! defined $CONFIG{HASHTYPE};

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